My worry is that if one component breaks, we have to replace the whole thing Why would you have to replace the whole thing? I guess we live in such a throwaway society at this point nobody considers repairing things anymore. However, one component failing earlier is a risk to take into consideration. I went with a KitchenAid convection microwave/wall oven combo and it's worked fine for 8 years, so I can't say I regret the decision. Speed ovens seem finicky to me, and I'm not sure we really need it There are no true speed oven/wall oven combo units. That KitchenAid does not have a speed oven on top, it's just a convection microwave. The closest you'll get is the GE Profile Advantium/wall oven combo, and I'm not a fan of that because the Advantium part is only 120V, which takes longer and gives lesser quality results than the 240V Advantium. I think the best option for you is to get a speed oven or a steam oven with a separate single oven below. That way if one component fails you don't have to replace both. You will need to redo the electrical though.

to azijoon I'm a bit unclear as to your actual question/issue. The Gaggenau Speed Ovens are only 220-240 units. If you need a 110-120V unit and you want heat with a microwave, you are looking at a convection-microwave combination. Personally I like the Panasonic models the best. Then you add a built-in trim kit to match your oven and viola: you have it. It really depends on your install situation and so on. Most homes can add a circuit for a true speed oven (using 220-240V). If you cannot then an option I have used to accommodate a 120V model is a simple one: change all the incandescent cans to LED (I like the TCP brand 2,700 degree reflectors from 1000bulbs.com the best BTW). This lowers the circuit load by 85%+ (using the 120W incandescent to 17W LED comparison! Plus it doesn't buzz and is dimmable. Pretty cool stuff. What am I saying? Well, a 20 amp breaker with 19 120W cans is 80% maxed at 2280 watts. Changing these to LEDs would use 323 watts, a savings of 1,957 watts. The top end Panasonic Convection uses a maximum 1,472 watts, which leaves a wide margin of success for adding to an existing circuit. For a little primer on the math here's an excellent description: http://www.milestoneelectricdfw.com/resources/faq-tripping-breaker Any who.... My Gaggenau BM455110 Speed Oven is not yet installed - as I live in the US and these models are not imported directly here for reasons I cannot discern other than low volumes and sales expectations. FWIW: I got the left hinge bottom controls to fit over a US sourced 24" self clean Gaggenau BI oven and warming drawer. I went through fesal.com from Italy to purchase my unit, and expect to have the cabinetry done sometime in the spring of 2016 for it's final installation (they are absolutely gorgeous BTW). Yes I know I forfeit the main warranty and so on and it is not UL approved, but it does operate on either 50 or 60 cycles and 220-240 volts according to the factory specifications - and that is about all I need to know. EU standards are definitely on par or possibly superior to UL, and the false notion that homeowners insurance would be invalidated is thoroughly incorrect on many levels. The Euro pricing was as low as I have seen from any country that I tried to export from (Australia, UK, Germany, Italy). More info? Just ask. I'll do my best to respond. Thanks

17 3/4 x 13" sheet pans fit in both my Miele Speed Oven & Wolf Combi Steam. The steam oven comes with 4 racks, two regular oven racks, one perforated tray & a solid metal tray. The Speed oven comes with a glass tray & one metal rack. When using the combination/bake mode (baking & microwaving at the same time), any metal cookware cannot touch the sides of the oven. so you couldn't use the 17x13 in that mode. 12 copcake pan fits, bundt pan fits. I don't have a Dutch Oven (a Le Creuset is on my wish list) but I believe it would fit. Just an FYI, we ended up with the Speed, Steam & a conventional oven because we do the big family holidays & needed 3 ovens. My plan was to get a convection microwave as the 3rd. We went to a Wolf cooking demonstration & fell in love with the steam oven (24"). We only had 24" & couldn't fit the Wolf Microwave/Convection oven so ended up with the Miele Speed oven. My husband works late & I get a 30 min notice when he's on his way home. We justified the cost of the Speed Oven based on his work schedule. I do like the Speed oven but I love the Steam oven. I use both almost exclusively as we are empty nesters. Another thing to keep in mind is that these are not self cleaning ovens.

So, make a niche(s) with the proper electric service and size to have a built-in put in if you really need it to sell (but I bet you won't)--if you're planning to sell within three years, get the built-ins already, but otherwise, they're going to be just so many used appliances. If yours are truly ratty, you can buy new versions of each. If you WANT a speed oven, and intend to use it as such, that's another story. Go for it! Read through the manuals, etc. But I think you'll find that it's not at all the same thing as your Breville toaster oven. You can use the convection oven settings on a speed oven to perform some of the same functions, but it's a real oven, with limitations, not a toaster that tap dances. I sometimes use my speed oven the way others use a toaster oven--mainly for heating up frozen appetizers or reheating casseroles when other ovens are full, but my old (dead) toaster oven was beloved for making great toast, which a speed oven isn't, and not for other uses. I do zap sandwiches on MW mode, and once in awhile lightly defrost or melt, but if I used a microwave more, I wouldn't have such an expensive machine doing it. I agree with putting enough thought into a remodel that it won't limit resale, because you never know what the future will bring--thus make sure there's place for built-ins to be built into--but unless it's a flip, it should be designed for your own use and enjoyment, and you used the key words "heavily use" and "love".